# Physics (just checking it)

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q:The electricity revised at an electric substation has a potential difference of 2.80 10^5V, if the required output is 440 V. what should be the ratio of the turns of the step-down transformer?

a: 28000/440= 636

• Physics (just checking it) -

correct. Voltage is in direct proportion to the turns. Actually, it would be better written as 636/1 or 636:1, since it is a ratio

• Physics (just checking it) -

thanks!

• Physics (just checking it) -

thank you as well. I doubted myself on this problem and whether or not the rate was proportionate to the turns and voltage. Thank you for clarifying it.

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